Oracle Corporation is an American multinational computer technology corporation that specializes in developing and marketing computer hardware systems and enterprise software products particularly database management systems. Headquartered at 500 Oracle Parkway, Redwood Shores, Redwood City, California, United States and employing approximately 111,298 people worldwide as of 30 November 2011, it has enlarged its share of the software market through organic growth and through a number of high-profile acquisitions. By 2007 Oracle had the third-largest software revenue, after Microsoft and IBM.